Windows 11 Cumulative Update 2025-10 breaks localhost applications

#1

Post by marksamman » Wed, Oct 15, 2025, 9:11 PM UTC

Windows 11 Cumulative Update 2025-10 breaks localhost applications
learn.microsoft.com

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#2

Post by WarOnPrivacy » Wed, Oct 15, 2025, 9:56 PM UTC

Link at bottom has some results about sudden, recent localhost failures

    working for several years, today localhost not found
    after GUI reboot attempt

    localhost and 127.0.0.1 should be the same, 
    it seems strange they shows different results.

    wusa /uninstall /kb:5066835 (restart)
    wusa /uninstall /kb:5066131 (restart)
    wusa /uninstall /kb:5065789 (restart)

ref: https://kagi.com/search?q=windows+localhost+not+working&dr=2...

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#3

Post by dehugger » Wed, Oct 15, 2025, 11:57 PM UTC

I'm shocked there's not more traction on this post. Breaking localhost is almost unthinkable to me. Of all the things network unit testing should cover, that's pretty close to the top.

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#4

Post by d3Xt3r » Thu, Oct 16, 2025, 12:48 AM UTC

Windows keeps becoming more and more worse and bloated every month. This month's update bumped up the install.wim by 400MB! And last month's update added a similar amount of bulk. It's insane how much junk Microsoft keeps adding to the OS, whilst breaking core functionality.

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#5

Post by ronsor » Thu, Oct 16, 2025, 1:33 AM UTC

d3Xt3r wrote: post #4

Windows keeps becoming more and more worse and bloated every month. This month's update bumped up the install.wim by 400MB! And last month's update added a similar amount of bulk. It's insane how much junk Microsoft keeps adding to the OS, whilst breaking core functionality.

Every time they add new things to the OS, the old functionality is crushed under the weight of the new.

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#6

Post by pjmlp » Thu, Oct 16, 2025, 5:25 AM UTC

d3Xt3r wrote: post #4

Windows keeps becoming more and more worse and bloated every month. This month's update bumped up the install.wim by 400MB! And last month's update added a similar amount of bulk. It's insane how much junk Microsoft keeps adding to the OS, whilst breaking core functionality.

Agreed, yet I don't see people rushing out to buy GNU/Linux powered laptops at Media Markt, because there aren't any.

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#7

Post by eddie_catflap » Thu, Oct 16, 2025, 7:44 AM UTC

dehugger wrote: post #3

I'm shocked there's not more traction on this post. Breaking localhost is almost unthinkable to me. Of all the things network unit testing should cover, that's pretty close to the top.

Same. The incident calls I'm on this morning agree too

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#8

Post by usui » Thu, Oct 16, 2025, 7:53 AM UTC

I'm more interested in how this update causes the issue. What is the mechanism?

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#9

Post by sebbu » Thu, Oct 16, 2025, 8:43 AM UTC

It seems like it only concerns IIS (and/or SChannel), and only for HTTP/2 (and maybe 3?). I use apache and openssl and doesn't have any issue.

Re: Windows 11 Cumulative Update 2025-10 breaks localhost applications

#10

Post by nebula8804 » Thu, Oct 16, 2025, 9:18 PM UTC

dehugger wrote: post #3

I'm shocked there's not more traction on this post. Breaking localhost is almost unthinkable to me. Of all the things network unit testing should cover, that's pretty close to the top.

They probably have ChatGPT running their test suite or some nonsense like that now.